Water-tube boiler.



l w. YHOFF. WATER TUBE BOILE'R.

APPLICATION FILED 050.2*1 1911.

Patented Nov. 30, 1915.

- products f combustion or heating gas guide il l WILHELM HOFF, QF KIEL, GERMANY, lASS IGNOR T0 FE'IEB.y KEUPP AKTIENGESELL- warns-Toen normar.

Application led December 21, 1911.

To all whom 'it may concern:

ing under artificialr draft and whichicomprise atleast oherupperboiler and one lower boiler and nests of tube's'fcnnecting them, such nests of tubes being subdivided by walls or batlles which latter form a number of `heating lues. ln boiler plants of this class, the chimneys or uptake pipes are mostly of only small dimensions, while the resistance opposed to the heating gases inside the boiler are comparatively great even when the artificial draft is taken into consideration. In consequence thereof when the artificial draftl is shut off the natural chimney draft isas a rule, onlysumcient for quite small boiler outputs, so that even with a slightly increased consumption of steam the fan has to be set going. As in such cases the fan is not used to its' full extent, its ef-V fective action is only small,` and the working costs expended are not in adequate proportion to the output of the boiler.

The object of this invention therefore, is to provide a. water tube boiler of the kind hereinbefore mentioned which has not the disadvantages above mentioned.

Three constructional forms of the subject matter .of the invention are illustrated by way of example in the drawing, in which- Figure 1 is a longitudinal vertical section of a water tube boiler with three upper'boilers, two lower boilers,

a water tube boiler with two upper boilers and one lower boiler, and Fig, 3 is a similar view of a water tube boiler with one upper and one lower boiler.

The .constructional form shown in Fig. l

will be described first.

The boiler consists 'of three upper boilers A Aland two lower boilers C, connected the two lower' boilers C is placed the furnace D. Between the nests of tubes B and B1 is arranged a superheater E, between each of which latter and the furnace chamber is Specication of Letters Patent.

and a. superheater. Fig. 2 is a View, corresponding to Fig. l, ofV

Between latented Nov. 30, 1915. serial no. 667,183, A

placed a valve G, by means of 'which each superheater can be thrown into, and out of action. Into the groups of tubes B are built heating gas guide walls or baffles F F1 of some re proof material, such as lire clay or the like, said guide walls consisting of parts F which run longitudinally of the nests of tubes B, and may if necessary be formed also of tube walls, andV of `short parts F1 lying at, or substantially at right angles thereto.

4On the inner side of thenests of tubes B1 are provided heating gas guide walls F2, which are carried under the superheater E and up, adjacent tothe nests of tubes B, in the shape of a U. 0n the outside, each nest of tubes Blis closed in by a` heating gas guide wall F3, which does not extend quite tween them and the surrounding masonry H,

are formed heating lues K.

Vihen theabove described boiler is worked under artificial draft, the valves T are brought into the position shown by full lines in Fig. l. The heating gases then first pass through the part of the nests of tubes B lying inside the guide walls F F1, then (after passing through the superlreater, if necessary.) into the part of the nests of tubes Blying outside the heating gaswall F F1, and afterward' pursue theirl course, guided by the. heating gas walls F2, F3, through the nests B1, and through the outer iue K into the chimney. If on ,the other hand the boiler has only'to generate a small quantity of steam, in which case it is notv proiitable to set the fan going, the nests of tubes B1, and the flues K, can be cut out by placing the valves J in the position indicated by dotted lines in ig. l. The-heating gases then pass through the nests of tubes B only, and then through the valve openings J direct tothe chimney. In

this way the resistance inside the furnace is ioo naturally considerably reduced, and an eili- 4 tw@ upf/@r boilers L (il, :md s. 10W i committed ihmvtw by n s of 'ixbes :md shmvs practically this left hand h; i110 boiler shawn iu Fis; 1. ii, nim diii i'imn time miici' first if-Sm'bd by ie he: inggus: guido will F3 ming axiniiglgi wi in iiia imei, of mima iii. s@ ilimt si po the tubes of this mwst if-Ways iies ir i' imi/i ingr ggzisiixio, ,H` )i siide miv@ i? iw fiks@ pmvided, insifzid 0i zi 'iivfied waive, ifm" 'Y iri'gz; mii the most if?, when Miri-Img' Under natural dmf.

Finaiiy in, 'Lim consti'uctimml form shown in Fig. the boiler consisstS only one. upper boiler sind (me imm? imi' which are cumiecod with @zich oimi by :i nest of tubes U This izitvi mesi B is di vided by two heating guide walls F, F13 thus farming thi-ee fines, and the outside Hue 01 ihese dime fines can be out ouf; by ope ing :1 slide .l when working; with natural boiler chimney difift.

In the boilers shown iii Figs. a miv@ oi' slide J is placed ai: i; plinzu; which lino @indem gffzwiiy 'coiiech iie adwiifigje Ui this is thai; when the miv@ oi' Shd if; opened the line, cimfieis sra Cnifiil iiio the, chimney.

daim:- 1, In mier mb@ boiiers hw" ,5 (me: upper :mi :mi: imvm' drivin iii@ cc 53 the iissw in fi Rites contin- Closed,

. 0]A JiS (OlifKfi/i mums, L'fxi'e wuiis inificd in saai@ i ts in h@ length di imi o' Ui@ minas und gatas zuljicnnt tha, Chimney ami 'iiimii' iaiicms of said imic Walls wiki dosed, hereby the ixfgniug film will im dii-@Ced through the ness in opprrsiir diifgction on opposite, sides of Said Wallis situzvd ai@ Such pnins ci fini: Cimiwi' mit La cmi" te) ido the limsi hifzit'iiig; jim

miv mici' im@ in @www the 1105 wiime KL when Gpen,

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